5 - Flooding and revision

Infiltration is...

• water flowing down a road

• water flowing onto a flood plain

• water sinking into the soil

• where a river meets the sea

A cause of flooding is when more rain falls than the river channel can hold and water flows over the banks onto the flood plain.

• true

• false

Rocks and soil that do not allow water to soak into them are called...

• permeable

• impermeable

Very wet soil means rain...

• is unable to soak into the ground causing more flooding

• will sink into the ground quickly causing less flooding

Which one of these will reduce the risk of flooding?

• cutting down trees

• building more roads

• planting trees

• building more houses

A "human" cause of flooding is...

• impermeable rocks

• building roads, houses and factories

• heavy rain

• steep valley sides

A "natural" cause of flooding is...

• steep valley sides

• building roads

• building houses

• urbanisation

Runoff is...

• water falling from the atmosphere as rain, hail, sleet or snow

• rainwater soaking into the ground

• evaporation of water from leaves

• rainwater moving over the ground surface

A ________________ is the starting point of the river.

• source

• triutaries

• mouth

• drainage basin

________________ are streams that flow together to make a river.

• source

• tributaries

• mouth

• drainage basin